JPH03127305A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain interchangeability with magnetic recording media of different recording capacities by integrating two pieces of magnetic head chips which vary in either of track width or gap length via a separator consisting of a nonmagnetic material so as to be matched in the direction approximately coincident with the track traveling direction of the recording media. CONSTITUTION:Two pieces of the magnetic head chips 2, 3 which vary in at least either of the track width or gap length to execute recording and reproducing are integrated via the separator 4 consisting of the nonmagnetic material between the two magnetic head chips 2 and 3 so as to be matched straight in the direction approximately coincident with the track traveling direction of the recording media. Recording and reproducing to and from two kinds of floppy disks by the compact single composite magnetic head 1 mounted on a head carriage are possible in this way and the interchangeability with the magnetic recording media of different recording capacities is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head formed by integrating a plurality of magnetic head chips, which is suitable for use in floppy disk drives, hard disk drives, etc. This invention relates to a magnetic head that is compatible with magnetic recording media having different track densities and line widths.

[Prior Art] Recently, with the increase in the capacity of magnetic memories such as floppy disks and hard disks, metal floppy disks that are compatible with higher recording densities have been developed as magnetic recording media, and recorded signals are recorded at linear recording densities and tracks. It has increased density. These floppy disks and hard disks come in various types with different linear recording densities and track densities, and magnetic heads usually have track widths and/or
Alternatively, magnetic recording media having different gap lengths have been manufactured individually and used for different types of magnetic recording media.

[Problems to be Solved by the Invention] As described above, conventionally, a magnetic head mounted on a so-called head carriage has a magnetic recording medium of a specific capacity type (
The track width and gap length are specified only for magnetic disks), and since the track width and gap length of the magnetic head on the head carriage are fixed to a single value, magnetic recording of 2 or more types is possible. It was not possible to record or reproduce information on the medium, and it was not compatible with different types of magnetic recording media.

The present invention has been made in view of the above points, and its object is to provide a magnetic head that is compatible with magnetic recording media of different recording capacities.

[Means for Solving 1llIW1] In order to achieve the above-mentioned object, the magnetic head according to the present invention uses two magnetic head chips that are different in at least one of the track width and the gap length that are to be recorded and reproduced together. integrated with a separator made of a non-magnetic material between the two magnetic head chips so that the two magnetic head chips are aligned in a straight line in a direction that substantially coincides with the track running direction of the magnetic recording medium;
It is considered to be a composition.

[Function] For example, the first track width and gap length are relatively large.
's magnetic head chip is wider than before. i′ affects γ
(Gamma) For floppy disks using iron oxide (first floppy disk).

In addition, a second magnetic head chip with relatively small track width and gap length is configured for use in high-density metal floppy disks (second floppy disks), which are becoming increasingly popular in recent years, and both magnetic head chips are compact. They are mounted on the head carriage in a serially integrated state. When recording and reproducing using the first magnetic head chip, a head forwarding (head seek, tracking) operation corresponding to the track pitch of the first floppy disk is performed, and when recording and reproducing using the second magnetic head chip. Then, a head movement operation corresponding to the track pitch of the second floppy disk is performed. This makes it possible to record and play back on 21i [Class 1 floppy disks] using a compact single composite magnetic head mounted on the head carriage, and provides compatibility with magnetic recording media of different recording capacities. It will be done.

[Example] Hereinafter, the present invention will be explained with reference to illustrated embodiments.

1 and 2 relate to a magnetic head according to a first embodiment of the present invention, FIG. 1 is a perspective view thereof, and FIG. 2 is a diagram showing the relationship between the working gap of two magnetic head chips and a track on a magnetic recording medium. It is an explanatory diagram showing a relationship.

In FIG. 1.2, a magnetic head is generally indicated by the reference numeral 1, and is mainly composed of a first magnetic head chip 2, a second magnetic head chip 3, and a separator 4. As shown in FIG.

The first magnetic head chip 2 includes a first core half 5 and a second core half 6, and the two core halves 5 and 6 are butted against each other at the front side and the rear side and bonded with a glass 7. At the same time, an operating gap 8 is formed on the front side via a gap regulating material (not shown). Further, a coil 9 is wound around the second core half 6 using a winding window.

In this embodiment, the first magnetic head chip 2 is configured for a floppy disk (first floppy disk) using gamma iron oxide (as a low-density head), and the first magnetic head chip 2 is configured for a floppy disk (first floppy disk) using gamma iron oxide (a low-density head). For example, the second core half-break 5.6 is Mn-Zn
It is made of bulk soft magnetic materials such as ferrite, which have been widely used in the past. If the first floppy disk is, for example, a 1.6 MB 3.5-inch disk, the track width T w + is approximately 115 μm, and the gap length is approximately 2 μm.

The second magnetic head chip 3 also includes a first core half 10 and a second core half 11, and the two core halves 10 and 11 are butted against each other on the front side and the rear side and joined by a glass 7. At the same time, an operating gap 12 is formed on the front side via a gap regulating material (not shown). Further, a coil 13 is wound around the second core half-opened 1 using a winding window.

In this embodiment, the second magnetic head chip 3 is configured for a so-called high-density metal floppy disk (second floppy disk) with a high coercive force using a metal carrier (as a high-density head). ), 1st. The second core half-hole 10.11 is made of, for example, sendust having a high saturation magnetic flux density and high magnetic permeability. If the second floppy disk is a 3.5-inch disk of 12.5 MB, for example, the track width T W 2 is about 50 μm,
The gap length is approximately 0.35 μm.

The first magnetic head chip 2 and the second magnetic head chip 3 have operating gaps 8 and 12 that are substantially orthogonal to the medium sliding (medium running) direction, and the main body portions are arranged in the direction of the medium sliding force. So that it aligns in a straight line in approximately the same direction as A,
The end faces are fixed in series through the separator 4.
be integrated.

This separator 4 is the first separator. Second magnetic head chip 2
, 3, and non-magnetic ceramics such as barium titanate, calcium titanate, and photoceram are used. In addition, 1. The second magnetic head chips 2 and 3 are fixed to the separator 4 using bonding glass as appropriate.

It is made with resin adhesive etc., and each member is 2°3.4
The height of the sliding surface is uniformly aligned.

Although not shown, the magnetic head 1 having the above-mentioned configuration is mounted on a spatula (Z carriage) and transported in the radial direction of the floppy disk via, for example, a known gimbal plate spring. 2 by γ
When recording and reproducing on the first floppy disk using iron oxide, a head feeding operation corresponding to the track pitch of the first floppy disk is performed, and the second magnetic head chip 3 uses the metal powder. When recording and reproducing information on a second floppy disk, a head movement operation corresponding to the track pitch of the second floppy disk is performed. This makes it possible to perform recording and reproduction on at least two types of floppy disks with different recording capacities using the compact GT-composite magnetic head 1 mounted on the head carriage.

Next, according to FIG. Second magnetic head chip 2
, 3 and the recording tracks of the magnetic disk (floppy disk) will be explained. The two working gaps 8, 12 are spaced apart on a straight line approximately along the gentle arc-shaped medium running direction (track running direction on the medium) A, so at least one of the working gaps 8, 12 One is the head movement radius line R of the magnetic disk.
It deviates from the top, and an azimuth shift θW,on occurs.

(In Fig. 2, for convenience of illustration, the radius of the trunk T + -T 2 on the magnetic disk is emphasized, but in reality it is an arc close to a straight line.) As is known, the azimuth deviation If this happens, the playback output will drop when playing back magnetic disks recorded with other disk drives. Since the influence of this azimuth shift on the reproduction output is proportional to the track width and inversely proportional to the recording wavelength, it is desirable that the distance between the working gaps 8 and 12 be determined according to the use of the system. For example, the compatibility of the currently announced systems is as follows:
Considering 1.6MB and 12.5MB of 3.5 inches, if the distance Dw and Dn from the radius line R to each working gap 8, 12 at the innermost circumference 1-rack is 200 μm, the azimuth deviation θW, θn is about 0.6 each
@, and the reproduction output range due to azimuth loss is approximately equal for both magnetic head chips 2.3, about 2 dB.5 An output range larger than this is practically undesirable, so in this embodiment, the above DW and Dn are The thickness should be set to 200 μm or less. Also, 1st. In order to cause the second magnetic head chips 2 and 3 to track substantially along the same radius line R as one unit.

It is desirable to make the azimuth deviations of the two working gaps 8 and 12 substantially equal, that is, to make I) W and On substantially equal, and in this embodiment, Dw.

Dn is set equal so that the distance between the working gaps 8 and 12 is 400 μm or less.

In this embodiment having such a configuration, a tracking (head feeding) operation can be performed using a conventional head feeding mechanism by simply adding a new medium density identification function.

FIG. 3 is a perspective view showing a magnetic head IA according to a second embodiment of the invention.

In this embodiment, the first core of the second magnetic head chip 20 is half-dead 21. The second core half 22 is made of, for example, Mn-Z.
A core base 23.24 formed of a bulk magnetic material such as n-ferrite, and an amorphous lnCo-Nb having high saturation magnetic flux density and high magnetic permeability deposited on the abutting surface side of the core base 23.24. The operating gap 27 is formed by bonding the front side soft magnetic films 25 and 26 through a gap regulating film (not shown). It is formed.

Note that 28 is a coil.

The second magnetic head chip 20 is a high-density head having sufficient recording and reproducing ability for a high-coercivity high-density metal floppy disk using metal powder,
The other first magnetic head chip 2 is the same as that of the first embodiment.

(The track width and gap length of the second magnetic head chip 20 are smaller than those of the first magnetic head chip.) Also in this second embodiment having such a configuration, the track width and gap length of the second magnetic head chip 20 are smaller than those of the first magnetic head chip. 1
There is an effect equivalent to that of the example.

FIG. 4 is a perspective view showing a magnetic head IB according to a third embodiment of the present invention.

This embodiment adds the first magnetic head to the magnetic head of the second embodiment.
The configuration is such that side erase magnetic head chips 30 and 30 are added for erasing signals on both sides of a signal track recorded by the magnetic head chip (low density head) 2. That is, in general, a low-density head (first magnetic head chip 2) has a relatively wide track width and does not require very high tracking accuracy, so it often does not have a precise tracking servo mechanism. Therefore, in this embodiment, the above-mentioned side erasing magnetic head chips 30.degree. 30 are provided so as to prevent the overriding IIS from being erased on both sides of the track by the first magnetic head chip 2.

As is clear from the drawings, in this embodiment, the thickness of the second magnetic head chip 20 of the second embodiment is slightly reduced, and both sides of the second magnetic head chip 20 are coated with non-magnetic ceramics, etc. Separator consisting of 31.31
is fixed, and the second magnetic head chip (high-density head)
20 and magnetic head chip for side erase 30.30
and are magnetically insulated. And this separator 3
The combined thickness of 1° 31 and the second magnetic head chip 2o is made equal to the thickness of the first magnetic head chip 2, and the outer surface of the separator 31, 31, the outer surface of the separator 4, and the A magnetic head chip 30 for side erasing is attached to a part of the outer surface of the first magnetic head chip 2.
．． 30 is fixed.

The side erase magnetic head chip 3o has a first core 32. It has a second core 33 and a back core 34, the first core 32 and the second core 33 are joined on the front side to form an operating gap 35, and the first core 32 and the second core 33 are connected to each other on the front side. The rear side is magnetically coupled via a back core 34. Also, the back core 34 has a coil 3.
6 is wound. The coil 36 of the magnetic hent chip 30 for side erase is connected to the coil 28 of the second magnetic head chip 20 as shown in the figure in order to prevent crosstalk with the second magnetic head chip (high-density head) 20. It is desirable to avoid crossing. Note that 37 and 37 are non-magnetic slider members fixed to both side surfaces of the first magnetic head chip 2.

Also in this third embodiment having such a configuration, the first
．． It has the same effect as the second embodiment.

When overriding by the first magnetic head chip 2, it is possible to side erase both sides of the signal track.

In each of the embodiments described above, the first head chip (low-density head) and the second magnetic head chip (high-density head) have different track widths and gap lengths. However, as long as at least one of the track width and the gap length is different, the present invention is compatible with different types of magnetic recording media and the present invention is applicable. Further, the structure, core material, etc. of the first head chip (low-density head) and the second magnetic head chip (high-density head) can be changed as desired.

[U Ming Effects] As described above, the present invention is compatible with two types of magnetic recording media. A compact magnetic head can be provided, and its industrial value is great.

[Brief explanation of the drawing]

1 and 2 relate to a first embodiment of the present invention, FIG. 1 is a perspective view of a magnetic head, and FIG. 2 is a relationship between the working gap of two magnetic head chips and tracks on a magnetic recording medium. FIG. 3 is a perspective view of a magnetic head according to a second embodiment of the invention, and FIG. 4 is a perspective view of a magnetic head according to a third embodiment of the invention. 1, IA, IB...Magnetic head, 2...
・First magnetic head chip (low density head), 3...
...Second magnetic head chip (high-density head), 4
... Separator, 5 ... First core half, 6 ... Second core half-off, 7 ... Glass, 8 ... Operation Gap, 9... Coil, 10... First core half, 11... Second core half, L2... Working gap, 13...
... Coil, 20 ... Second magnetic head chip (high-density head), 21 ... First core half-off, 22 ... Second core half-off, 23 ,24...
... Core substrate, 25.26 ... Soft magnetic film, 27
......operating gap, 28...coil,
30... Magnetic head chip for side erase, 31... Separator, 32... First
Core 533...second core, 34...back core, 35...operating gap, 36...
...Coil, 37...Slider material. Fu1chido U) Seventh ward Kihe1/dotef. 12 Operation j (゛Mashi: γ Fig. 2 Fig. 3 Fig. 4

Claims (3)

[Claims] (1) Align two magnetic head chips that are to perform recording and reproduction together, with at least one different track width or gap length, in a straight line in a direction that substantially coincides with the track running direction of the magnetic recording medium. A magnetic head characterized in that both magnetic head chips are integrated with a separator made of a non-magnetic material interposed between the two magnetic head chips. (2) The magnetic head according to claim 1, wherein the working gap distance between the two magnetic head chips is 400 μm or less. (3) In claim 1, the two magnetic head chips have different track widths, and a magnetic head chip for side erasing a signal recorded by the magnetic head chip having a large track width; A magnetic head characterized by being arranged on both sides so as to be magnetically insulated from a magnetic head chip with a small track width.